Thresher-screen.



(No Model.)

J. H. JENSEN.

THRESHER SCREEN.

Application filed July 16, 1906.)

Patented Aug. l2, I902.

2 Shuts-Shem l.

UNITED STA? JENS ll. JENSEN, Oh NI NDEN, NEBRASKA.

THRESJHER-SGFZEEN.

SPECIFICATION forming part of Letters Patent Lie. *?Q?,G57, dated August 12, 1902.

Application filed July 15 1900. Serial 23,797. lilo model.)

To all whom it may concern:

Be it known that I, Jess 11'. Jensen, a citizen of the United States, residing at Mindcn, in the county of Kearney and State of Nebraska, have invented certain new and useful Improvements in Thresher-Screens, oi which the following is a full, clear, and on act specification.

My invention relates to that of thresher screens-such, shown in my United States Letters Paton t- N 648,588, granted May 1, 1900-411 which i employed two thin apertured plates arranged face to face and relatively adjustable, whereby the size of fthe openings or mesh may altered to suit the varying requirements.

One of the important objects of my inven tion is to provide means for supporting the screens or apertured plates at one or more points intermediate of their edges and hold ing their opposed faces accurately L :ther, so as to prevent the possibility of g, i other small particles passing or lodging: be-

tween them and to maintain the surface of l the screen perfectly level.

Another object of my invention is to cause the grain and the wind to pass in parallel currents above and below the screens, re spectively, whereby side currents of air and the lateral shifting of the grain will be anew lntely prevented.

Another object of my invention to ro vide improved means for maintaining the parallelism of the plates-that is to say, preventing the edges of the apertures in one plate from changing their angularity with. reference to the edges of the apertures in the other platc-thus insuring against any variation in the formation of the mesh, as would he the case should one plate swerve with reference to the other instead of moving in a direct line.

- Afurther object of my invention is to provide means whereby the size of the mesh may beascertained from the exterior; and a still further object is to provide minor details of improvement whereby the material to be screened will be directed toward and maintained on the screen and prevented from sliding sidewise and the trash, straw, and long; particles held aloof from the screen and pie vented from clogging itsapertures.

for instance, as

n the said drawings, Figure 1 is a transseetional vie-wot my improved thresheron taken on thcline 1 1, Fig. 2. Fig. 2 is in plan view thereof. Fig. 3 is a lon- .udinel section taken on the line 3 3, Fig. 2. l is a transverse section on the line 4 4, Fig. is a longitudinal section on the Fig. 2; and Fig. (i is an enlarged detical sectional View of one of the angling-bolts hereinafter described.

1 represents the top screen or aperturcd plate, having apertures 2 cut therein to constitute the mesh, and 3 represents the bottom screen or apertured plate, having apertures 4. The apertures 2'4 are preferably square, and those in the upper plate may be made larger than those in-the lower plate, though not necessarily so. These plates are arranged face to face one upon the other, and hilfi bohhfilll one, 3, supported at its edges upon beams 5 6, extending transversely and longitudinallythereof.

H K lilllfililiwlfifi of the line of moveiel to be screened as it comes ..i are a number of thin bars or inc-l1 l on to the sum str' ig'e 7 which impinge the under side of the bottom plate 3 along the lines of the crosshars betworn the meshes, as clearly shown in Figs. 1 end 1, and which support the bottom ti! suitable intervals between the beams 5 against downward movement, thus holding it preferably level and in accurate contact with the under side of the top plate 1, while the latter is held down in accurate engagement with the bottom plate by similar bars or stringers in, which stand on edge on top of the pi to 1 and are arranged parallel with the bars 7 and also over and lengthwise of that ill the surface of the lower screen bee n the apertures, sees not to obstruct the and which stringers hold the top plate n 1 perfectly ilat and level and at the time prevent the material or grain from They also perform the further useful and important function of holding the trash and straw and other long particles aloof from the screenplates and prevent the mesh of the letter from becoming clogged thereby. 'lhe stringers or bars 7 are supported at their ends in l. o end beams 5, while the stringers 8 are supported by the bars 7 by means of L-shaped bolts 9, whose lower ends are firmly secured in the bars 7, while their upper ends pass through the apertures of the plates 1 3 and are firmly secured to the sides of the bars 8 by means of straps .10 or other suitable devices, such 'Jolts ll being arranged at suitable intervals throughout the length of the bars 7 8 and being so small in diameter and placed in one of the corners of the apertures of the plates 1 and 3 as not to interfere with the adjustment of the top plate to form the minimum size of mesh. By this means it will be seen that the plates may be relatively adjusted for varying the size of the mesh, while their faces are held in accurate engagement and all possibility of the material finding its way be tween such faces pro vented. The lower cross bar 7 may, if desired, be further reinforced or bracedat suitable intervals by means of beams 11, secured to the longitudinal beams I and having the bars or stringers 7 let into their upper edges, as better shown in .l igs. l and 4, and it is also preferable to pass hookshaped bolts 0 through the beams 11 and engage their upper hooked ends 9 over the edges of the upper stringers S.

In order that the material to be screened may be kept upon the screen and the upper plate 1 at t he same time permitted free movement, I arrange shields 12 along the lougi-- tudinal edges of the apparatus parallel with the line of movement of the material as it comes onto the screen, and these shields 1;? have their faces inclined toward and overlapping the plate 1, as better shown in Fig. 1, so that the plate may move freely under the shield, while the latter, in conjunction with stringers 8, will hold the material evenly divided on the screen and prevent particles from engaging the edge of the top plate and obstructing its movement.

The top plate 1 is adjustable both transversely and longitudinally,whereby thcopeulogs or mesh of the screen as a whole maybe multiplied and at the same time have their individual dimensions reduced. This is effected by bringing tho poiutof conjunction of the cross-bars which constitute the apertures in one plate at or about the center of the aperture of the other plate, as shown in dotted lines in Fig. :2. As a means for adjusting the plate 1 in one of these directions I provide thebottom ofthe plate witha ribbed block 13, the ribs of which are of sullioient length to remain in engagement with an adjusting-worm 1. while the plate 1 moves its maximum distance lengthwise of said teeth or transversely of the worm 1-1. The worm 1-1 is journaled in a suitable hearing if), so-

cured to the under side of the beam H or to any other suitable support, and engages with the block 13 in a well-known manner, the worm being provided with an operating handle or wheel 16, whereby it may be turned for shifting the plate lengthwise of the worm or what might be termed transversely of the screen. The plate 1 is shifted in the other direction or longitudinally by means of pinions 17, mounted on a shaft 18, which is journaled in boxes 19 on the under sides of the beams G, and which pinions 17 engage with rack-bars 20, secured to the under side of the plate 1 and having their teeth arranged at right angles to the ribs of the block 13. The pinions 17 are looseon the shaft 18, so as to be capable of sliding relatively to the shaft, but are compelled to turn therewith. This condition may be conveniently effected by making the shaft 18 square or angular in cross-section and the apertures through the pinions 1f) ofcorresponding formation. The edges of the rack-bars 520 may he provided with depending flanges Ell, which make the pinions l7 slide lengthwise of the shaft 18 when the upper screen is moved longitudinallyand still remain in mesh with the rackbars 20. The outer end of the shaft id is provided with an operating handle or wheel 2; or other suitable device. With this orrangement it will be soon that the top screen 1 maybe adjusted both longitudinally and transversely or laterally by rotating the wheels 1d 2; in the proper direction, and it will also be seen that the two points of ooh nection between the plate 1 and the shaft i8 being greatly removed from each other all tendency of said plate to oscillate on an in dependent axis, so as to shift the edges of its apertures out of parallelism with the edges of the apertures in the bottom plate, will be prevented, and this desirable result will also be largely contributed to by the engagement of the ribs of the block lii with the worm 14.

The bottom plate i} may be provided with deflectors :33 for catching the current of air and directing it upwardlythrough the meshes of the screen without i'ii'torfering with the supporting bars or stringers T.

The purpose of making the apertures 2 in thenpper plate l larger than those in the irotom plate!) is to provide for a larger-mesh whoa the conjunction of the t'rossbars forniiug tho aporturt-s in the upper plate are lorated ventrally with retort-rum lo the apertures in the lower plate and at which time the plates are in position to produce the mini mum-size mesh. 'lhis dill'erence in the size of the openings or apertures also crumbles me to employ the support'ng-bolts fl 5) and pass the same through the apertures without prevei ting the upper-plate from being adjusted to expose the full opening of the lower plate. In order that the size of the mesh may be determined from the exterior, I provide the screens with an index or gage consisting of a plate 3i, projecting from the edge of one of as the upper plate 1 is adjusted, making a relative movement between the apertnred plate 24 and the cross 25, the mesh of the two plates 1 3 will be duplicated by the plate 24 and cross 25.

Having thus described my invention, what I claim as new therein, and desire to secure 7 by Letters Patent, is-

1. In a screen the combination of two relatively adjustable apertnred plates arranged face to face, stringers arranged across the face of the upper one of said plates and extending longitudinally of the screen, stringers arranged under the lower one of said plates longitudinally of the screen and means for connecting said stringers together, sub stantially as set forth. i

2. In a screen the combination of two relatively adjustable apertured plates, a frame for supporting said plates, a projection ex= tending through said frame and representing the apertures in one of said plates and a pro jcction extending from the other of said plates and overlapping said first projection and representing the apertures in the letter said plate for constituting a gage indicating the size of mesh of the screen, substantially as set forth.

3. In a screen the combination of two relatively adjustable apertured plates arranged face to face, stringers secured under independently of and supporting the lower one of; said plates, stringers arranged over the fare of the upper one of said plates for holding it down and means connecting said second stringers with said first stringers and thereby holding said second stringers against movement with the upper one of said plates, sol stantially as set forth.

4. In a screen the combination of two relatively adjustable apertured plates, stringers arranged under the lower one of said plates, stringers extending over the upper one of said plates, crossbeams extending under and supporting said first stringers, and means supporting said cross-beams atintervals from said stringers, substantially as set forth,

5. In .a screen the combination of two relatively adjustable screen-plates arranged into to face, stringers located across one of said plates, stringers arranged across the other of said plates and being fixed with relation to both of said plates, and connections passing through said plates and securing said string ers together, the adjustable one of said plates being movable longitudinally and transversely and having apertures for the passage of said connections of greater diameter than said connections in all directions whereby said adjustable plate may mo vc transversely and longitudinally independently of said connections, substantially as set forth.

o. in a screen the combination of a screen proper, a plurality of stringers arranged at short intervals apart across one face of said screen and extending longitudinally of the screen, a plurality of stringers arranged at short intervals apart across the other face of said screen and extending lengthwise of said first stringers and means extending through said screen proper and connecting the stringers on one side thereof with the stringers on the other, substantially as set forth.

75 in screen the combination of two aperplates arranged face to face and being reiati elysiijnstable, a plurality of stringers at short intervals apart across the f said plates and extending 1011- the screen, a pluralityof stringn c l at intervals across the face of said plates and extending lengthof first stringers, and means extent g through said plates and connecting the on one side thereof with the st n s on the other, substantially as set in in screen the combination of two apertursd plates arranged face to face and being el sdjnstable transversely and longi a plurality of continuous stringers .l across the face of one of said plates .nd extending longitudinally of the screen, and being fixed against movement with said plates, a plurality of stringers arranged across the face of the other of said plates, and means passing through said plates and securing said stringers together, substantially as set fo th. 9. in screen the combination of two apertured plates arranged face to face and being relatively adjustable transversely and longitudinally, a plurality of continuous stringers arranged across the face of one of said plates and extending longitudinally of the screen and lacing fined against movement with said plates, a plurality of continuous stringers arranged across the face of the other of said I. and extending lengthwise of said first and. means passing through said securing said stringers together,

' is set forth. ten the combination of upper 52 ertnred plates arranged face to gersextonding longitudinally of i and bearing upon the face of the i said plates, stringers extending inaily of the screen and hearing the face of the lower one of said means passing through said plates and aid stringers together, cross-bars said lower stringers and w through said plates and coneross-hars with said upper stringly as set forth. ten. the combination of a screen ig apertures therein stringers ex- .ungitudinally of said screen and bearing against the upper face thereof, stringstringers and connections passing through the 10 ers extending lengthwise of said first string; apertures of the screen proper mid secured at are and bearingagainst the lower-face of said their upper and lower ends to said upper screen proper, said stringers being located to stringers and cross -bars respectively, subone side of or between the apertures of said steutially set forth.

EDNA H. JoliNsoN.

screen proper, means passing through the, JESS H. JEISEN. apertures of said screen proper and connectl Witnesses: ing said stringers together, cross-bars m F F A. HOPKINS, l I

ranged under and supporting said lower 

